When picking items for your registry, it's always a good idea to pick items that are high quality but not outrageously expensive. That said, there are several kitchen items that are worth spending more on.
The Knot provides this list of items to splurge on when registering:
Sterling Silver Flatware: Don't skip the silver, the more you use it, the better it looks!
Fine Dining: Contrary to popular belief, porcelain and bone china are tougher and more durable than stoneware. Don't feel like you have to save your china exclusively for special occasions!
Kitchen Knives: High-quality knives are probably the single best investment you can make in your kitchen. Allowing you to prep meals faster, more easily, and more safely, you will immediately notice the impact of a quality knife on your cooking.